We trained our cat to a lead..... I'm not talking going for walks like lassy mind.
we have a washing line tied between 2 concrete posts with one of those extendible leads tied to it with a garden tie. just tight enough so it slides nicely but doesn't jerk. we put the cat in a harness and clip it to the extender lead.
She goes hunting for frogs, rolls in the sand does every thing a cat normally does but cant get close enough to the chickens to do them any harm.
Took about a month of sitting out with her in harness an hour a day just to monitor de-tangle etc. before she learnt what can and cant be done.
MUST use harness though NOT clipped straight to collar. Clip the lead straight to the collar the cat will escape or worse break its neck. The worst that will happen if she forgets she is on a harness and dashes headlong after something is a server winding. She'll suddenly find her horizontal momentum has become vertical preform a quick bit of acrobatics and if she is anything like my cat will sneak a peek to see if she can see you. EVERY time this has happened when I'm in the garden or the field there have be melodramatics but when I've been spying from the study window she simply picks her self up turns and scrapes the dust as if she was covering up a poo and sulks in a sunny spot for a few minuets.
It's been a year on the lead now and the cat loves it she will come running from the remotest corners of the house if you shout "walkies", she even brings me her harness and leaves it by the back door accusingly if i have been out for the day and haven't given her a "walk"